Caring for Your Watch Through the Seasons
Mechanical watches are more sensitive to their environment than most owners expect. In summer, avoid leaving a watch on a sun-warmed dashboard or windowsill, since prolonged heat can dry out the lubricants inside the movement.
In colder months, let a watch that has been outside return to room temperature before opening the case-back, to avoid condensation.
If a watch will sit unworn for more than a few weeks, wind it fully and set it aside face-up rather than leaving it wound down indefinitely, which can affect the mainspring over time.